Ononot — The hyperbola \frac{x^2}{a^2} - \frac{y^2}{b^2} = 1 has ecce

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Circles & Conicshard

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The hyperbola $\frac{x^2}{a^2} - \frac{y^2}{b^2} = 1$ has eccentricity $e = \sqrt{5}$ . If it passes through $(2, 1)$ , what is the value of $a^2$ ?